SEDL / STP / STP601-EB / STP28660S

A Laser Interferometry Method for Experimental Stress Intensity Factor Calibration

Macha, DE
Materials research engineers, Air Force Materials Laboratory, Wright-Patterson Air Force Base, Ohio

Sharpe, WN
Professor, Michigan State University, East Lansing, Mich.

Grandt, AF
Materials research engineers, Air Force Materials Laboratory, Wright-Patterson Air Force Base, Ohio

Pages: 16    Published: Jan 1976

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Abstract

A laser interferometry crack tip opening displacement measurement technique has been developed and is described here. This interferometric displacement gage was used to measure displacements near the crack tip in flawed specimens. Measured displacements were then converted to stress intensity factor calibration curves by means of the linear elastic fracture mechanics displacement equations. Application of this procedure to compact and edge-cracked aluminum specimens resulted in experimental stress intensity factor calibrations that agreed well with theoretical predictions for these two geometries.